This directory contains examples for the 'chem' language.

You can view the graphical display of the examples by calling

    groffer <file>

'groffer' calls 'chem' automatically.

If you want to transform example files to a different format use the
'roff2*' programs:

'roff2dvi' prints dvi format to standard output,
'roff2html' generates html output,
'roff2pdf' outputs pdf mode,
'roff2ps' produces PostScript output,
'roff2text' generates text output in the groff device 'latin1',
'roff2x' prints the output  in  the  groff  device  X  that  is
         suitable  for programs  like 'gxditview' or 'xditview'.

To get a suitable 'groff' output run

    @g@chem <file> | groff -p ...

On the displays, you can see rings consisting of several lines and
bonds (lines).  All points on rings and bonds that do not have a
notation mean a C atom (carbon) filled with H atoms (hydrogen) such
that the valence of 4 is satisfied.

For example, suppose you have just a single line without any
characters.  That means a bond.  It has two points, one at each end of
the line.  So each of these points stands for a C atom, the bond
itself connects these 2 C atoms.  To fulfill the valence of 4, each
points has to carry additionally 3 H atoms.  So the single empty bond
stands for CH3-CH3, though this combination doesn't make much sense
chemically.


####### License

Copyright (C) 2006-2018 Free Software Foundation, Inc.
Written by Bernd Warken <groff-bernd.warken-72@web.de>.

This file is part of 'chem', which is part of 'groff'.

'groff' is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

'groff' is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

The GPL2 license text is available in the internet at
<http://www.gnu.org/licenses/gpl-2.0.html>.


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